light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 21

Thermal conductivity of aluminium, copper and stainless steel increases in the order

a) Stainless Steel < Aluminium < Copper

b) Copper < Aluminium < Stainless Steel

c) Aluyminium < Copper < Stainless Steel

d) Copper < Stainless Steel < Aluminium

Answer: (a)

Question : 22

According to the kinetic theory of gases

a) at any instant one-third of the total atoms are moving along x-axis

b) all the atoms move horizontally with equal speeds

c) an atom moves faster during its downward motion than its upward motion

d) None of these

Answer: (a)

Question : 23 [IAS (Pre) 1993]

When there is depletion of ozone in the stratosphere, the wavelength of radiation striking the Earth’s surface will be

a) $10^{-2}$ m

b) 10–7 m

c) 10–10 m

d) 100 m

Answer: (b)

Question : 24

Consider the following statements:

  1. Loudness or softness of a sound is determined by its amplitude.
  2. Two sounds of same loudness and pitch can be distinguished by quality.
  3. The speed of sound decreases on increasing the temperature.
Which of these statements is/are correct ?

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3

Answer: (b)

The speed of sound is related with temperature of medium as v ∝√T.

Question : 25 [IAS (Pre) 2003]

Diffusion of light in the atmosphere takes place due to

a) Helium

b) Dust particles

c) Carbon dioxide

d) Water vapours

Answer: (b)

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